Study type: Medical/biological study (experimental study)

Long-term, low-level microwave irradiation of rats med./bio.

Published in: Bioelectromagnetics 1992; 13 (6): 469-496

Aim of study (acc. to author)

To expose a large population of rats to microwave radiation throughout most of their lifetimes and to monitor them for effects on general health and longevity.



Exposure Parameters
Exposure 1: 2.45 GHz
Modulation type: pulsed
Exposure duration: repeated daily exposure, 21.5 h/day for 25 months

Exposure 1

Main characteristics
Frequency 2.45 GHz
Exposure duration repeated daily exposure, 21.5 h/day for 25 months
Additional info Circularly polarized. 2,45 GHz was chosen so that each rat would have approximately the same size to wavelength ratio as a human being exposed to 1 mW/cm² 450 MHz RF field.
Modulation type pulsed
Pulse width 10 µs
Packets per second 800
Repetition frequency 8 Hz
Additional info

Modulation characteristics of the pulses: 8 groups per second, fifty 10 µs wide pulses per group with a repetition rate of 800 pps. The period was 125 ms; with pulse onsets separated by 1.25 ms interval.

Exposure setup
Exposure source
Setup Animals housed in plastic cages
Additional info Exposure facility consisted of two rooms consisting of 100 waveguides. Each alcove housed 20 waveguides mounted on four horizontal shelves, 5 waveguides per shelf. The exposure and sham exposure waveguides were randomly arranged. Each exposure room was equipped with two 2.45 GHz pulsed microwave sources
Measurand Value Type Method Mass Remarks
power 144 mW - measured - -
SAR 0.4 W/kg mean determined by power loss - for 200 g rat
SAR 0.15 W/kg mean determined by power loss - for 800 g rat

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

The results showed no biologically significant effects on general health, serum chemistry, hematological profiles, longevity, cause of death, and lesions associated with aging and benign neoplasia. Statistically significant effects were found in corticosterone levels and immunological parameters at 13 months exposure (the results could not be confirmed in a follow-up study). In exposed young rats O2 consumption and CO2 production were lower (the effects were not observed in mature rats). The results of an excess of primary malignancies in exposed rats is provocative.

Study character:

Study funded by

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